Specialized - Switching Tube ·Thyratron
Cold-cathode gas-discharge switching tube. Available source material confirms heaterless thyratron-type construction but does not establish a narrower application.
Z70U is a Other device in the supplied Amperex literature. Cold-cathode gas-filled trigger tube for pulse/control circuits; source explicitly co-designates the numeric and Z-series type.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Subminiature cold-cathode trigger tube with positive starter and priming cathode for DC circuits.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
StarterIgnitionVoltageMinimum
137 V
AnodeVoltage=250V
StarterIgnitionVoltageMaximum
153 V
AnodeVoltage=250V
AnodeIgnitionVoltageMinimum
325 V
MaintainingVoltageMinimum
113 V
AnodeCurrent=3mA
MaintainingVoltageMaximum
121 V
AnodeCurrent=3mA
CountingSpeedMinimum
3 kHz
DC counting
CountingSpeedMaximum
5 kHz
DC counting
Data set 02
Published operating points and test conditions from this source.
Anode voltage range
200 to 310 V
DC
Peak cathode current
16 mA
Recommended priming resistor
18 MOhm
Cathode current range
2 to 4 mA
DC
Starter-to-cathode breakdown voltage
137 to 153 V
Anode-to-cathode sustaining voltage
111 to 121 V
Anode-to-cathode breakdown voltage
>325 V
Data set 03
Published operating points and test conditions from this source.
Starter breakdown voltage at 250 V supply
137 to 153 V
Temperature coefficient of starter breakdown voltage
-25 mV/degC
Maximum
Anode maintaining voltage at 3 mA
111 to 121 V
Anode-cathode breakdown voltage at starter 0 V
340 to - V
Minimum
Anode-to-primer breakdown voltage
- to 200 V
Maximum
Starter maintaining voltage
105 to 125 V
Ist=30uA; Ia=0
Anode breakdown delay time
- to 5 us
Maximum
Minimum anode supply voltage for DC ignition
200 to - V
Maximum anode supply voltage for pulsed ignition
- to 310 V
Peak cathode current
- to 200 mA
Average cathode current
- to 5 mA
Primer current
- to 12 uA
Data set 04
Published operating points and test conditions from this source.
Starter ignition voltage minimum
137 V
Starter ignition voltage maximum
153 V
Anode maintaining voltage
117 V
Ia=3mA
Anode ignition voltage
325 V